Journal of Novel Physiotherapies
Open Access

Abstract

Background: ACL injury is a commonly seen knee injury in different sport activities. This non-contact injury may contribute to the excessive knee stress during the landing phase of single leg jumping. But, the mechanism of protection against this type of injury still not confirmed. Purpose: This study aimed to detect the relationships among peak- knee flexion angle , knee moment, ankle moment and ground reaction force that may detect the mechanism of decreasing the knee joint stress and non-contact anterior cruciate ligament (ACL) injury during landing. Material & Methods: A randomized cross section study with 9 healthy male elite hand-ball players from the first Saudi handball team of 2015 was conducted. The participants performed a single-leg landing from jumping on force plate in which the maximum angle of knee flexion (KFApk) was detected. The knee-extensor moment (KM), ankle- planter flexion moment (AM) and ground reaction moment (GRM) of 3 successful landings for dominant extremity were measured using a threedimensional motion analysis system (VICON; Bonita cameras, 250frames/s) and 2 force platforms (AMTI OR6, AMTI Inc., 1000Hz). Results: Pearson product moment correlation coefficient was calculated among the mean of (KFApk), (KM), and (AM) and (GRM). Results revealed that greater KFApk related to both lesser KM (r=-0.876, P<0.01) and normalized GRM (r=-.868, P<0.01). We also found more knee flexion angle was related to greater AM (r=0.777, P<0.05). Conclusion: Our findings indicated that with increase in the knee flexion angle there should be an automatic reaction of leaning forward to decrease the anterior shear stress on ACL.

Biography

Email: mamahmoud@uod.edu.sa